[MacPorts] #55977: update the py*-pip packages (py27-pip, py36-pip, etc) to add new pip select targets for major python releases such as pip2 or pip3

[MacPorts]

#55977: update the py*-pip packages (py27-pip, py36-pip, etc) to add new pip select
targets for major python releases such as pip2 or pip3
-------------------------+--------------------------------
 Reporter:  qbuchanan    |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  python, pip  |       Port:  py27-pip, py36-pip
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 I would propose that two new select targets be created for the python pip
 packages, pip2 and pip3.  These new pip select targets would be based upon
 the major python release number and mirror current select targets for
 python2 and python3.  These additions would provide symmetry for the way
 python is currently handled with python select as well as mirror the
 functionality found with python on other OS's such as Linux (Ubuntu,
 Debian), Windows, etc.

 If you can point me in the right direction in order to learn how to add
 these select targets, I would be happy to help ;-)

   TIA

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Ticket URL: <https://trac.macports.org/ticket/55977>
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